Re: 1999 sls battery drain

Pull the negative battery cable and place a 12v test lamp in line between the cable and the battery terminal. A drain should illuminate the test lamp. Start pulling fuses until the lamp extinguishes. That will tell you what circuit or component to focus on.

Re: 1999 sls battery drain

howdy thank you fer quick reply will do i have read an old reply about the bose amp to a guy in england i belive it was from you. thanks again have looked at this fourmfor years this was my first post, yall have help me many times in the past thank you very much have a great day

Re: 1999 sls battery drain

Just for information to anyone trying this method of finding the battery draw. I thought it made perfect sense so I tried it and I pulled every fuse and relay one at a time and the light stayed on. Then I pulled all the fuses and relays and the light was off so I started to insert them one at a time till the light came on. When it came on I pulled that one back out and continued replaceing them and the light came on with another one. Seems there were two circuits causing the draw and pulling one at a time didn't disconnect the draw.
Dave

Originally Posted by Ranger

Pull the negative battery cable and place a 12v test lamp in line between the cable and the battery terminal. A drain should illuminate the test lamp. Start pulling fuses until the lamp extinguishes. That will tell you what circuit or component to focus on.

Re: 1999 SLS battery drain

This Insertion of a test lamp has a flaw.
A number of circuits stay 'active' for a short period of time after key off.
I've replaced the test lamp with an amp meter and watched the current after the key was turned off. Couple amps for many minutes...and in wasn't all out at the same time.
I forget what sleep mode draws; 20-30 ma.?

Re: 1999 SLS battery drain

Does that apply with the battery cable disconected? The only voltage entering the system is what comes through the fillament of the test light bulb so I would think the ability of the delay protocal would be nullified.

Dave

Originally Posted by Harry Yarnell

This Insertion of a test lamp has a flaw.
A number of circuits stay 'active' for a short period of time after key off.
I've replaced the test lamp with an amp meter and watched the current after the key was turned off. Couple amps for many minutes...and in wasn't all out at the same time.
I forget what sleep mode draws; 20-30 ma.?